Novak Djokovic has battled through four sets with Taylor Fritz to set up a semifinal showdown with his ATP Finals nemesis Jannik Sinner who defated Andrey Rublev, Aryna Sabalenka has ousted Barbora Krejcikova in straight sets to book in a US Open Final rematch against Coco Gauff who held off Marta Kostyuk — ­our experts Robbie Koenig and Simon Rea dissect the result and preview the men’s quarterfinal between Carlos Alcaraz and Alexander Zverev on Day 11, and Australian Open cult figure Marcos Baghdatis shares his five-setter survival guide.